Piston protruding block
#1
Piston protruding block
I put a cdb together today, and have found the Piston protrudes the block by around 1.7mm
and on the down stroke the piston skirt hits the Oil Squirter.
The Crank was meant to be a 2.0 billet crank and was bought from TSL in Feb.
I am thinking that it may be a 2.5 crank but am unsure?
The components used were.
2.0 Billet crank. (NEW)
Ths Rods (NEW)
RCMS Omega Pistons (Re-Used)
ACL Race Series Bearings.
here is a Pic of the block with piston sticking out...
very large so link
www.s-o-r.co.uk/uploads/03052009064.jpg
any ideas or suggestions?
If it is a 2.5 then i need some pistons to make it a 2.1 stroker..?
Derek
and on the down stroke the piston skirt hits the Oil Squirter.
The Crank was meant to be a 2.0 billet crank and was bought from TSL in Feb.
I am thinking that it may be a 2.5 crank but am unsure?
The components used were.
2.0 Billet crank. (NEW)
Ths Rods (NEW)
RCMS Omega Pistons (Re-Used)
ACL Race Series Bearings.
here is a Pic of the block with piston sticking out...
very large so link
www.s-o-r.co.uk/uploads/03052009064.jpg
any ideas or suggestions?
If it is a 2.5 then i need some pistons to make it a 2.1 stroker..?
Derek
#2
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Hi if you are putting a 2.1 stroker together you need an EJ257 crankshaft and if you are using standard hight pistons you will need MM shorter rods that may be why the pistons are protruding out of the block?
#3
The build was just meant to be a 2.0.
The crank was on ebay as a 2.0 Billet crank.
I called TSL and told them what i was building.. and they told me it would be fine.
But now it was put together the piston protrudes out the block.
I am guessing how far, as i did not have a DTI to hand...
The crank was on ebay as a 2.0 Billet crank.
I called TSL and told them what i was building.. and they told me it would be fine.
But now it was put together the piston protrudes out the block.
I am guessing how far, as i did not have a DTI to hand...
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Does the engine turn through a full 360 degrees ? As there would be an extra 4 mm of throw on the crank.
Are you supposed to machine said piston to suit the deck height ? Thus getting the correct compression.
In the late 70's this was how I did my Imp engines.
dunx
Are you supposed to machine said piston to suit the deck height ? Thus getting the correct compression.
In the late 70's this was how I did my Imp engines.
dunx
Last edited by dunx; 04 May 2009 at 12:51 PM.
#12
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I know dazdavies on here had to cut parts of his RCMS piston so it would clear the oil squirter.
Plus the protrusion on that deck face doesn't look good. It could be a 2.5 crank but then your block would need to been machined to accept a rear thrust bearing crank which the 2.5 is.
I think you need to have a good measure up of everything and post the full spec on here.
Plus the protrusion on that deck face doesn't look good. It could be a 2.5 crank but then your block would need to been machined to accept a rear thrust bearing crank which the 2.5 is.
I think you need to have a good measure up of everything and post the full spec on here.
#13
The engine will turn over Fully with a ratchet on the crank Bolt, but you cannot do it by hand, when it hits the oil squirter's.
I will talk to Olly @ RCMS tomorrow, and get out the DTI and see how much the piston is protruding. before i rip the block apart.
I will talk to Olly @ RCMS tomorrow, and get out the DTI and see how much the piston is protruding. before i rip the block apart.
#15
Ok People, Spoke to TSL, they say as far as they were aware it was a Std Stroke 2.0 Billet Steel Crank.
However, the stoke has been measured by measuring the distance from the top of the piston at BDC, to the top of the Block.
and the top of the block to the top of the piston at TDC.
And this is 79mm which is the Same Stroke as a 2.5
However, the stoke has been measured by measuring the distance from the top of the piston at BDC, to the top of the Block.
and the top of the block to the top of the piston at TDC.
And this is 79mm which is the Same Stroke as a 2.5
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